JPS6143292B2 - - Google Patents
Info
- Publication number
- JPS6143292B2 JPS6143292B2 JP15984378A JP15984378A JPS6143292B2 JP S6143292 B2 JPS6143292 B2 JP S6143292B2 JP 15984378 A JP15984378 A JP 15984378A JP 15984378 A JP15984378 A JP 15984378A JP S6143292 B2 JPS6143292 B2 JP S6143292B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- liquid
- target
- fine
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011521 glass Substances 0.000 claims description 59
- 239000000843 powder Substances 0.000 claims description 48
- 239000007788 liquid Substances 0.000 claims description 37
- 239000013307 optical fiber Substances 0.000 claims description 17
- 239000002994 raw material Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000000151 deposition Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 18
- 238000005253 cladding Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000004111 Potassium silicate Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 3
- 229910052913 potassium silicate Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- LTPBRCUWZOMYOC-UHFFFAOYSA-N Beryllium oxide Chemical compound O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 2
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
- C03B37/01291—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process
- C03B37/01294—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass by progressive melting, e.g. melting glass powder during delivery to and adhering the so-formed melt to a target or preform, e.g. the Plasma Oxidation Deposition [POD] process by delivering pulverulent glass to the deposition target or preform where the powder is progressively melted, e.g. accretion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
先に本発明者は、光フアイバのガラス組成物原
料として液体原料を用い、この液体原料にマイク
ロ波を照射する工程と、該工程により得られたガ
ラス微粉末体を加熱、溶融、延伸する工程を含む
光フアイバの製造方法を提案した（昭和53年５月
22日特許出願、特願昭53―59432号、特公昭61―
4779号）。この方法で言う液体原料はアルカリ金
属シリケートの水溶液、屈折率制御用のドーパン
トの水溶液を含んだアルカリ金属シリケートの水
溶液、さらにはアルキル化物、水素化物、ハロゲ
ン化物からなるシリコン化合物あるいは屈折率制
御用化合物などを水に分散または溶解させた液、
などである。この方法は、マイクロ波オーブン内
に配置されたるつぼ内に、一定量の液体を充填し
ておいてマイクロ波を照射させガラス微粉末体を
得るか、あるいは液体を連続的にるつぼ内に流下
させながらマイクロ波を照射させてガラス微粉末
体を生成させ、そのるつぼを加熱してるつぼのノ
ズルから光フアイバを引き出す方法であつた。液
体にマイクロ波のエネルギを吸収させることによ
り液体中の水分を蒸発させ、石英系、あるいは多
成分系のガラス微粉末体が極めて単時間に生成で
きるという利点を有している。ところが、るつぼ
内に一定量の液体を充填しておいてマイクロ波を
照射させる方法ではマイクロ波の照射時間と共に
水が蒸発するので液体に吸収されるマイクロ波の
電力が、例えば第１図に示すように減少する（す
なわち、マイクロ波の負荷が変化する）ために、
液体量が多い場合には生成されたガラス微粉末体
の緻密度が不均一になり易い。第１図はマイクロ
波照射時間と被照射物への吸収電力との関係を示
したグラフで、100c.c.の珪酸カリウム水溶液
（SiO2／K2Oのモル比は3.38で、比重は1.247）を
容量300c.c.のるつぼ中に充填してマイクロ波を照
射した場合である。また、液体をるつぼ内に連続
的に流下させてるつぼ内にガラス微粉末を堆積さ
せ、そのノズルから連続的に光フアイバを得る方
法でも流体の流下量が多い場合にはマイクロ波の
負荷（るつぼ内のガラス微粉末の量）を常に一定
に保つのが容易でない。DETAILED DESCRIPTION OF THE INVENTION First, the present inventor used a liquid raw material as a raw material for a glass composition of an optical fiber, and described a step of irradiating the liquid raw material with microwaves, and a fine glass powder obtained by the step. Proposed a method for manufacturing optical fiber that included heating, melting, and drawing processes (May 1973)
Patent application filed on the 22nd, Japanese Patent Application No. 59432, Special Publication No. 1987-
No. 4779). The liquid raw materials used in this method include an aqueous solution of an alkali metal silicate, an aqueous solution of an alkali metal silicate containing an aqueous solution of a dopant for controlling the refractive index, and a silicon compound or a compound for controlling the refractive index consisting of an alkylate, hydride, or halide. A liquid obtained by dispersing or dissolving something in water,
etc. In this method, a certain amount of liquid is filled in a crucible placed in a microwave oven and irradiated with microwaves to obtain a fine glass powder, or the liquid is continuously allowed to flow into the crucible. The method used was to irradiate microwaves to produce fine glass powder, heat the crucible, and draw out the optical fiber from the nozzle of the crucible. It has the advantage that water in the liquid is evaporated by absorbing microwave energy into the liquid, and quartz-based or multi-component glass fine powder can be produced in a very short time. However, in the method of filling a crucible with a certain amount of liquid and irradiating it with microwaves, the water evaporates as the microwave irradiates, so the microwave power absorbed by the liquid is reduced as shown in Figure 1, for example. (i.e. the microwave load changes),
When the amount of liquid is large, the density of the produced glass fine powder tends to be non-uniform. Figure 1 is a graph showing the relationship between microwave irradiation time and power absorbed by the irradiated object. ) was filled in a crucible with a capacity of 300 c.c. and irradiated with microwaves. In addition, even with a method in which glass fine powder is deposited in a crucible in which liquid is continuously allowed to flow down into the crucible and optical fibers are continuously obtained from the nozzle, if the amount of fluid flowing down is large, microwave loading (crucible It is not easy to keep the amount of fine glass powder in the glass constant at all times.
本発明の目的は液体の量が多い場合でも常にマ
イクロ波の負荷条件を一定に保つようにすること
（すなわち、液体に吸収されるマイクロ波のエネ
ルギを一定に保つこと）により、長尺、大口径、
かつ緻密構造のガラス微粉末ロツドを得ることに
ある。その方法は、マイクロ波オープン内に、軸
方向に移動するターゲツトを設け、そのターゲツ
ト上に液体を流下させながらその流下液体にマイ
クロ波を照射させてターゲツト上に、透明、ある
いは不透明な緻密質の光フアイバのコア用ガラス
微粉末ロツド、または多重同芯ガラス層構造（い
わゆる光フアイバ母材）のガラス微粉末ロツドを
堆積させるようにしたものである。したがつて、
本発明の主な構成は、１）ホツパーのノズルから
マイクロ波オープン内に配置されたターゲツト上
に一定量の液体を流下させる装置、２）ホツパー
のノズルからターゲツト上の液体表面までの距離
を常に一定に保つようにする装置、３）マイクロ
波オーブン内に一定電力のマイクロ波を供給する
装置、などである。 The purpose of the present invention is to always keep the microwave load condition constant even when the amount of liquid is large (that is, to keep the microwave energy absorbed by the liquid constant), so that long and large Caliber,
The object of the present invention is to obtain a glass fine powder rod having a dense structure. In this method, a target that moves in the axial direction is set up in a microwave oven, and while a liquid is flowing down onto the target, the flowing liquid is irradiated with microwaves. A fine glass powder rod for the core of an optical fiber or a glass fine powder rod for a multi-concentric glass layer structure (so-called optical fiber matrix) is deposited. Therefore,
The main components of the present invention are: 1) a device that allows a certain amount of liquid to flow down from a hopper nozzle onto a target placed in a microwave open; 2) a device that constantly controls the distance from the hopper nozzle to the liquid surface on the target. 3) a device that supplies microwaves with a constant power into a microwave oven;
以下、実施例を用いて本発明の方法を説明す
る。 The method of the present invention will be explained below using Examples.
第２図は光フアイバのコア用ガラス微粉末ロツ
ド１２をターゲツト９上に堆積させる装置の一実
施例である。これはホツパー６内に充填された液
体原料７をノズル６′から流下させながらマイク
ロ波を照射させてマイクロ波オーブン１内に配置
されたターゲツト９上にガラス微粉末１２を堆積
させる装置である。マイクロ波の負荷を一定に保
つために、ホツパーのノズルからターゲツト上の
ガラス微粉末表面までの距離が一定になるように
ターゲツト９は矢印１０方向へ移動する。またタ
ーゲツト９を矢印１１（あるいはその逆）方向に
回転させることによつてターゲツト上にガラス微
粉末を一様に堆積させるようにしてある。マイク
ロ波オーブン１は電子レンジを改造することによ
り、流下液体に対するマイクロ波照射むらが少な
い構造である。マイクロ波オーブン内へのマイク
ロ波の供給はマイクロ波電源（マグネトロン発振
器）２から導波管３、アンテナ４を通して供給さ
れている（周波数2450±50MHz，電力600W）。８
はターゲツト上へガラス微粉末１２を効率よく捕
集し、ガラス微粉末ロツド１２の外径を一様にす
るための保護管であり、その材質は比誘導電率ε
s，誘電体損失角tanδ共に小さいもの、たとえば
石英ガラスが好ましい。ターゲツトの材質も保護
管８と同様にマイクロ波のエネルギの吸収の少な
い石英ガラスが好ましい。１３はターゲツト上に
流下した液体にガス圧を加えることによつてより
微密質なガラス微粉末体１２を得るために用いる
ガス供給装置であり、矢印１４，１４′のごとく
送り込み、矢印１４″，１４のごとく排出す
る。５はアンテナ４を回転させるためのモータで
あり、アンテナ４を回転させることによつて流下
液体へのマイクロ波照射むらを抑えている。第２
図の装置を用いた実施例を述べる。ターゲツト９
には外径73mm〓，内径70mm〓，高さ25mmの石英製
円筒皿を用いた。そして矢印１１方向へ30rpmで
回転させつつ、矢印１０方向へ５mm／minの速度
で移動させた。また保護管８には外径80mm〓、内
径75mm〓、高さ150mmの石英管を用いた。ホツパ
ー６内に珪酸カリウム水溶液（K2O・nSiO2・
xH2O，SiO2／K2Oモル比3.41，比重1.249，商品
名オーカシール、東京応化工業製品）７を充填
し、ノズル６′から流出させた。その結果、ノズ
ル６′からの液体流出量が0.05c.c.／sec以下の場合
にはターゲツト９上に透明なガラス微粉末体が生
成された。液体流出量が0.1c.c.／sec以上の場合に
は不透明（純白）だが緻密質のガラス微粉末体が
生成された。ただし、この場合のマイクロ波オー
ブン１内に供給されているマイクロ波電力は約
500Wであり、また、ガス供給装置１３より送り
込んだガス流量は10／min（N2ガス）であつ
た。マイクロ波電力を大きくすれば、透明なガラ
ス微粉末体が生成される液体流出量は上記0.05
c.c.／secよりも多くすることが可能となる。な
お、上記実施例において、液体流出量が0.1c.c.／
sec程度の場合には直径75mm〓，長さ125mmのガラ
ス微粉末のロツド（重量約46ｇ）を約20分で得る
ことができた。 FIG. 2 shows an embodiment of an apparatus for depositing a fine glass powder rod 12 for the core of an optical fiber onto a target 9. As shown in FIG. This is an apparatus that deposits glass fine powder 12 on a target 9 placed in a microwave oven 1 by irradiating microwaves while flowing a liquid raw material 7 filled in a hopper 6 down from a nozzle 6'. In order to keep the microwave load constant, the target 9 is moved in the direction of the arrow 10 so that the distance from the hopper nozzle to the surface of the fine glass powder on the target remains constant. Further, by rotating the target 9 in the direction of the arrow 11 (or vice versa), the fine glass powder is uniformly deposited on the target. The microwave oven 1 has a structure in which uneven microwave irradiation to the flowing liquid is reduced by modifying the microwave oven. Microwaves are supplied into the microwave oven from a microwave power source (magnetron oscillator) 2 through a waveguide 3 and an antenna 4 (frequency 2450±50MHz, power 600W). 8
is a protection tube that efficiently collects the glass fine powder 12 onto the target and makes the outer diameter of the glass fine powder rod 12 uniform, and its material has a specific dielectric constant ε
A material having small both s and dielectric loss angle tan δ, such as quartz glass, is preferable. As with the protective tube 8, the material of the target is preferably quartz glass, which absorbs little microwave energy. Reference numeral 13 denotes a gas supply device used to obtain finer glass fine powder 12 by applying gas pressure to the liquid flowing down onto the target. , 14. 5 is a motor for rotating the antenna 4, and by rotating the antenna 4, uneven microwave irradiation to the flowing liquid is suppressed.Second
An example using the apparatus shown in the figure will be described. Target 9
A cylindrical quartz plate with an outer diameter of 73 mm, an inner diameter of 70 mm, and a height of 25 mm was used. Then, while rotating in the direction of arrow 11 at 30 rpm, it was moved in the direction of arrow 10 at a speed of 5 mm/min. In addition, a quartz tube with an outer diameter of 80 mm, an inner diameter of 75 mm, and a height of 150 mm was used as the protection tube 8. A potassium silicate aqueous solution (K 2 O・nSiO 2・
xH 2 O, SiO 2 /K 2 O molar ratio 3.41, specific gravity 1.249, trade name Orka Seal, Tokyo Ohka Kogyo product) 7 was filled and flowed out from the nozzle 6'. As a result, when the amount of liquid flowing out from the nozzle 6' was 0.05 cc/sec or less, transparent fine glass powder was produced on the target 9. When the liquid flow rate was 0.1 cc/sec or more, opaque (pure white) but dense glass fine powder was produced. However, in this case, the microwave power supplied to microwave oven 1 is approximately
500W, and the gas flow rate fed from the gas supply device 13 was 10/min (N 2 gas). If the microwave power is increased, the amount of liquid flowing out to produce transparent glass fine powder will be 0.05 as above.
It becomes possible to increase the number of times more than cc/sec. In addition, in the above example, the liquid outflow amount is 0.1cc/
In the case of about sec, it was possible to obtain a rod of fine glass powder (weighing about 46 g) with a diameter of 75 mm and a length of 125 mm in about 20 minutes.
第３図は２重同芯ガラス層構造のガラス微粉末
ロツドを堆積させる装置の一実施例を示したもの
である。すなわち、ホツパー、保護管、およびタ
ーゲツトを２重同芯構造としたもので、中心ホツ
パー１５内に光フアイバのコア用の液体原料１６
を充填し、外側ホツパー１７内に光フアイバのク
ラツド用の液体原料１８を充填し、各々のノズル
から液体を保護管８，８′を通してターゲツト
９′上に流下させる方法である。そして、２重同
芯ターゲツト９′の中心部にコア用のガラス微粉
末１６′を、外側部にクラツド用のガラス微粉末
１８′を堆積させる。この方法でコアとクラツド
の界面を密着性よくしてガラス微粉末を堆積させ
るには同図に示すように保護管８，８′の下方部
でガラス微粉末を生成させるようにすればよい。
孔１９はガス排出口である。第３図の実施例につ
いて述べる。１６に珪酸カリウム水溶液
（SiO2／K2Oモル比3.41，比重1.249，商品名オー
カシール，東京応化工業製品）を用い、１８に珪
酸カリウム水溶液（SiO2／K2Oモル比3.92，比重
1.244，東京応化工業製品）を用いた。そしてこ
れらの液体を0.1c.c.／secの流出速度で流出させた
が、ガラス微粉末のクラツド径およびコア径とも
ほぼ保護管８，８′の内径に依存して生成される
ことを肉眼で観測することができた。この２重ガ
ラス微粉末ロツドを電気炉（温度1100℃）内に
徐々に挿入していつてガラス化し、その後このガ
ラスロツドの断面の屈折率を測定した結果、コア
の屈折率1.505，クラツドの屈折率1.495であり、
光フアイバ母材になつていた。 FIG. 3 shows an embodiment of an apparatus for depositing fine glass powder rods having a double concentric glass layer structure. That is, the hopper, the protection tube, and the target have a double concentric structure, and the liquid raw material 16 for the core of the optical fiber is placed in the center hopper 15.
In this method, the outer hopper 17 is filled with a liquid raw material 18 for cladding the optical fiber, and the liquid is caused to flow down from each nozzle through the protection tubes 8 and 8' onto the target 9'. Then, fine glass powder 16' for the core is deposited at the center of the double concentric target 9', and fine glass powder 18' for the cladding is deposited at the outer part. In order to improve the adhesion of the interface between the core and the cladding and deposit the fine glass powder using this method, the fine glass powder may be generated in the lower portions of the protective tubes 8 and 8', as shown in the figure.
Hole 19 is a gas outlet. The embodiment shown in FIG. 3 will be described. For 16, a potassium silicate aqueous solution (SiO 2 /K 2 O molar ratio 3.41, specific gravity 1.249, trade name Oka Seal, Tokyo Ohka Kogyo product) was used, and for 18, a potassium silicate aqueous solution (SiO 2 /K 2 O molar ratio 3.92, specific gravity
1.244, Tokyo Ohka Kogyo product) was used. These liquids were flowed out at a flow rate of 0.1 cc/sec, and it was observed with the naked eye that the cladding diameter and core diameter of the fine glass powder were generated depending on the inner diameter of the protective tubes 8 and 8'. I was able to do that. This double glass fine powder rod was gradually inserted into an electric furnace (temperature 1100°C) to vitrify it, and then the refractive index of the cross section of this glass rod was measured. As a result, the refractive index of the core was 1.505, and the refractive index of the cladding was 1.495. and
It had become the base material for optical fiber.
第４図は第３図と同様の２重同芯ガラス層構造
のガラス微粉末ロツドを堆積させる装置である。
この装置はコアとクラツドの界面がより密着した
構造のガラス微粉末ロツドを得るためのものであ
る。コアとクラツドの界面の密着性をよくするた
めに、２重保護管の内側管８″の長さを外側管８
の長さよりも短かくし、かつ、ターゲツト９″を
一重の円筒皿にしたものである。 FIG. 4 shows an apparatus for depositing a fine glass powder rod having a double concentric glass layer structure similar to that shown in FIG.
This device is used to obtain a fine glass powder rod with a structure in which the interface between the core and the cladding is in close contact with each other. In order to improve the adhesion between the core and the cladding interface, the length of the inner tube of the double protection tube is 8" and the length of the outer tube is 8".
The target 9'' is made into a single cylindrical plate.
第５図はガラス微粉末を堆積させる工程と、そ
のガラス微粉末のロツド１２をガラス化する工程
とを含んだ装置であり、ガラス化したロツド２０
を連続的に製造する装置の一実施例である。すな
わち、マイクロ波オーブン１の上段でガラス微粉
末ロツド１２を堆積させ、下段に設けた加熱源２
１で徐々にガラス化する装置である。２２はガス
導入管であり、これはガス供給装置２３から矢印
２４のごとく送られてきたガスをガラス微粉末ロ
ツドに吹きつけることにより、加熱源２１の熱が
上部へ伝達するのを抑制するためと、清浄な雰囲
気中で脱水、脱泡を容易に行わせるためのもので
ある。ガスの種類は、Ar，He，N2，あるいは酸
化性ガスなどを用いることができる。 FIG. 5 shows an apparatus that includes a step of depositing fine glass powder and a step of vitrifying rods 12 of the fine glass powder.
This is an example of an apparatus for continuously manufacturing. That is, a fine glass powder rod 12 is deposited in the upper stage of the microwave oven 1, and a heating source 2 provided in the lower stage is deposited.
This is a device that gradually vitrifies the glass in step 1. 22 is a gas introduction pipe, which is used to suppress the heat from the heating source 21 from being transmitted to the upper part by blowing the gas sent from the gas supply device 23 as shown by the arrow 24 onto the fine glass powder rod. This is to facilitate dehydration and defoaming in a clean atmosphere. As for the type of gas, Ar, He, N 2 or oxidizing gas can be used.
第６図は２重るつぼ法による光フアイバの製造
装置の概略図を示したものである。これは第２
図、あるいは第５図の方法で得たコア用のガラス
微粉末ロツド（あるいはガラス化ロツド）２７、
クラツド用ガラス微粉末ロツド（あるいはガラス
化ロツド）２８を加熱源３１で加熱されている各
るつぼ２５，２６内に所望速度で挿入（矢印２
９，３０）しながらるつぼのノズル３２，３３か
ら流出する溶融ガラスを引き出して光フアイバ３
４とし、これをドラム３５で巻き取る方法であ
る。この方法でガラス微粉末ロツドをるつぼ内に
挿入する場合には加熱源３１を高温部と低温部の
２ゾーンに分け、るつぼの上部の高温部でガラス
微粉末ロツドを液相状態にまで溶融し、ノズル付
近の低温部でガラスの線引温度に保つようにすれ
ば散乱損矢の少ない光フアイバを実現できる。 FIG. 6 shows a schematic diagram of an optical fiber manufacturing apparatus using the double crucible method. This is the second
A fine glass powder rod (or vitrified rod) 27 for the core obtained by the method shown in FIG.
A fine glass powder rod for cladding (or a vitrification rod) 28 is inserted at a desired speed into each crucible 25, 26 heated by a heat source 31 (arrow 2
9, 30) while pulling out the molten glass flowing out from the nozzles 32, 33 of the crucible and inserting it into the optical fiber 3.
4 and wind it up with a drum 35. When inserting a fine glass powder rod into a crucible using this method, the heating source 31 is divided into two zones, a high temperature zone and a low temperature zone, and the fine glass powder rod is melted to a liquid phase in the high temperature zone at the top of the crucible. If the drawing temperature of the glass is maintained in a low-temperature part near the nozzle, an optical fiber with less scattered arrow loss can be realized.
以上の説明からわかるように、本発明の方法は
マイクロ波の負荷を常に一定に保つように設定す
ることにより、長尺、大口径、かつ緻密構造のガ
ラス微粉末ロツドを得ることができるという効果
を有している。 As can be seen from the above explanation, the method of the present invention has the advantage that by setting the microwave load to be kept constant, it is possible to obtain a long, large diameter, and densely structured glass fine powder rod. have.
本発明の方法は上記実施例に限定されない。ま
ず液体原料は先に本発明者が提案した方法（昭和
53年５月22日特許出願）に述べているものを適用
できる。マイクロ波の周波数は500MHzから
5000MHzぐらいまでが適用できる。加えるマイク
ロ波のエネルギは大きいほど短時間に脱水化を行
わせることができるので数10KW程度まで用いる
ことができる。マイクロ波オーブンの代りに導波
管、空胴共振器などでもよい。ターゲツトおよび
保護管の材質は石英ガラス以外に、96％シリカガ
ラス、ソーダ石灰ガラス、ほうけい酸ガラスなど
のガラス、あるいはアルミナ、ベリリアなどの磁
器でもよい。ホツパーからの液体の流出速度はマ
イクロ波の電力が大きくなれば数c.c.／sec程度で
もよい。ホツパーは３重以上の同芯構造のもので
もよい。ガラス微粉末ロツドは第５図のごとく連
続プロセスでガラス化する以外に、バツチ方式で
ガラス化してもよい。ガラス化したロツドは、従
来のプリフオームを線引きする方法で線引きして
もよい。また、ガラス化したロツドをガラス管内
に挿入し、ロツドインチユーブ法で線引きしても
よい。 The method of the invention is not limited to the above examples. First, liquid raw materials are prepared using the method previously proposed by the present inventor (Showa
(patent application filed May 22, 1953) can be applied. Microwave frequency starts from 500MHz
Applicable up to about 5000MHz. The higher the microwave energy applied, the faster dehydration can be achieved, so it can be used up to several tens of kilowatts. A waveguide, a cavity resonator, etc. may be used instead of a microwave oven. In addition to quartz glass, the target and protection tube may be made of glass such as 96% silica glass, soda lime glass, or borosilicate glass, or porcelain such as alumina or beryllia. The flow rate of the liquid from the hopper may be approximately several cc/sec if the microwave power is increased. The hopper may have a concentric structure of three or more layers. In addition to vitrifying the fine glass powder rod in a continuous process as shown in FIG. 5, it may also be vitrified in batches. The vitrified rod may be drawn using conventional preform drawing methods. Alternatively, a vitrified rod may be inserted into a glass tube and drawn using the rod incubation method.
第１図は従来技術におけるマイクロ波照射時間
と被照射物の吸収電力との関係を示すグラフ、第
２図〜第５図はいずれも本発明による製造方法の
各実施例で用いる製造装置の断面図、第６図は本
発明の製造方法により得られたガラス微粉末ロツ
ドを用いて光フアイバを製造する装置の一例を示
す断面図である。
各図において、１はマイクロ波オーブン、４は
アンテナ、６はホツパー、６′はノズル、７は液
体原料、８は保護管、９，９′はターゲツト、１
２はガラス微粉末ロツド、１４，１４′はガス導
入方向、１５は中心ホツパー、１６はコア用液体
原料、１７は外側ホツパー、１８はクラツド用液
体原料、１６′はコア用ガラス微粉末、１８′はク
ラツド用ガラス微粉末、１９はガス排出口、２０
はガラス化したロツド、２１は加熱源、２２はガ
ス導入管、２５，２６はるつぼ、３４は光フアイ
バである。
FIG. 1 is a graph showing the relationship between microwave irradiation time and absorbed power of the irradiated object in the prior art, and FIGS. 2 to 5 are cross sections of manufacturing equipment used in each embodiment of the manufacturing method according to the present invention. 6 are cross-sectional views showing an example of an apparatus for manufacturing an optical fiber using a fine glass powder rod obtained by the manufacturing method of the present invention. In each figure, 1 is a microwave oven, 4 is an antenna, 6 is a hopper, 6' is a nozzle, 7 is a liquid raw material, 8 is a protection tube, 9, 9' is a target, 1
2 is a glass fine powder rod, 14, 14' is a gas introduction direction, 15 is a center hopper, 16 is a liquid raw material for the core, 17 is an outer hopper, 18 is a liquid raw material for a cladding, 16' is a glass fine powder for a core, 18 ' is glass fine powder for cladding, 19 is gas outlet, 20
21 is a vitrified rod, 21 is a heating source, 22 is a gas introduction tube, 25 and 26 are crucibles, and 34 is an optical fiber.
Claims (1)
解、あるいは分散した状態のガラス組成物液体原
料を流下させながら、その流下液体にマイクロ波
を照射させて該ターゲツト上にガラス微粉末を堆
積させることを特徴とする光フアイバ母材用ガラ
ス微粉末ロツドの製造方法。 ２ 特許請求の範囲第１項において、前記ターゲ
ツトを多重同心円構造とし、該ターゲツト上に屈
折率の異なるガラス組成物液体原料を流下させ、
多重同心円状にガラス微粉末を堆積させることを
特徴とする光フアイバ母材用ガラス微粉末ロツド
の製造方法。[Claims] 1. A glass composition liquid raw material dissolved or dispersed in water is allowed to flow down onto a target moving in the axial direction, and the flowing liquid is irradiated with microwaves to form glass onto the target. A method for producing a glass fine powder rod for optical fiber base material, which comprises depositing fine powder. 2. In claim 1, the target has a multi-concentric structure, and liquid glass composition raw materials having different refractive indexes are allowed to flow down onto the target,
A method for producing a fine glass powder rod for an optical fiber base material, characterized by depositing fine glass powder in multiple concentric circles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15984378A JPS5590428A (en) | 1978-12-27 | 1978-12-27 | Preparation of glass inpalpable powder rod for optical fiber basic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15984378A JPS5590428A (en) | 1978-12-27 | 1978-12-27 | Preparation of glass inpalpable powder rod for optical fiber basic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5590428A JPS5590428A (en) | 1980-07-09 |
| JPS6143292B2 true JPS6143292B2 (en) | 1986-09-26 |
Family
ID=15702442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15984378A Granted JPS5590428A (en) | 1978-12-27 | 1978-12-27 | Preparation of glass inpalpable powder rod for optical fiber basic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5590428A (en) |
-
1978
- 1978-12-27 JP JP15984378A patent/JPS5590428A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5590428A (en) | 1980-07-09 |
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